Latex compositions comprising pozzolan and/or cement kiln dust and methods of use

ABSTRACT

The present invention includes methods and compositions that include a latex, and at least one of a natural pozzolan or cement kiln dust. An embodiment includes a method comprising: placing a latex composition in a subterranean formation, wherein the latex composition comprises: latex, a component selected from the group consisting of a natural pozzolan, cement kiln dust, and a combination thereof, and water; and allowing the latex composition to set. Another embodiment of the present invention includes a latex composition comprising: latex, a component selected from the group consisting of a natural pozzolan, cement kiln dust, and a combination thereof.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation in part of U.S. application Ser. No.12/420,630, entitled “Cement Compositions Having Cement Kiln Dust and/orPumicite and Methods of Use,” filed on Apr. 8, 2009, which is acontinuation in part of U.S. application Ser. No. 12/349,676, entitled“Extended Settable Compositions Comprising Cement Kiln Dust andAssociated Methods,” filed on Jan. 7, 2009, which is a divisional ofU.S. application Ser. No. 12/034,886 entitled “Extended SettableCompositions Comprising Cement Kiln Dust and Associated Methods, filedon Feb. 21, 2008, which is a continuation in part of U.S. applicationSer. No. 11/223,669 entitled “Settable Compositions Comprising CementKiln Dust and Additive(s),” filed Sep. 9, 2005, the entire disclosuresof which are incorporated herein by reference.

BACKGROUND

The present invention relates to cementing operations and, moreparticularly, in certain embodiments, to compositions and methods thatinclude a latex and at least one of a natural pozzolan (e.g., pumicite)or cement kiln dust (“CKD”).

In cementing methods, such as well construction and remedial cementing,cement compositions are commonly utilized. Cement compositions may beused in primary cementing operations whereby pipe strings, such ascasing and liners, are cemented in well bores. In performing primarycementing, a cement composition may be pumped into an annulus between asubterranean formation and the pipe string disposed in the subterraneanformation. The cement composition should set in the annulus, therebyforming an annular sheath of hardened cement (e.g., a cement sheath)that supports and positions the pipe string in the well bore and bondsthe exterior surface of the pipe string to the walls of the well bore.Cement compositions also may be used in remedial cementing methods, suchas the placement of cement plug and squeeze cementing for sealing voidsin a pipe string, cement sheath, gravel pack, formation, and the like.

Cement compositions for use in subterranean formations may include alatex to improve various properties of the compositions. For example,the latex may be included in a cement composition for fluid losscontrol, to provide resiliency to the set cement, and/or to reduce theissues associated with gas channeling. In general, the latex used incement compositions is often provided as a water-in-oil emulsioncontaining high quantities of natural or synthetic rubber (such asstyrene-butadiene rubber). However, latex-containing cement compositionstypically may have reduced strength with respect to comparable cementcompositions.

Cement compositions for use in subterranean formations may furtherinclude Portland cement. Portland cement generally is a major componentof the cost for the cement compositions. To reduce the cost of suchcement compositions, other components may be included in the cementcomposition in addition to, or in place of, the Portland cement. Suchcomponents may include fly ash, slag cement, shale, metakaolin,micro-fine cement, and the like. “Fly ash,” as that term is used herein,refers to the residue from the combustion of powdered or ground coal,wherein the fly ash carried by the flue gases may be recovered, forexample, by electrostatic precipitation. “Slag,” as that term is usedherein, refers to a granulated, blast furnace by-product formed in theproduction of cast iron and generally comprises the oxidized impuritiesfound in iron ore. Slag cement generally comprises slag and a base, forexample, such as sodium hydroxide, sodium bicarbonate, sodium carbonate,or lime, to produce a hydraulic composition that, when combined withwater, may set to form a hardened mass.

Cement compositions may further include natural pozzolans. Naturalpozzolans are generally present on the Earth's surface and set andharden in the presence of hydrated lime and water. Examples of naturalpozzolans include pumicite, diatomaceous earth, volcanic ash, opalineshale, tuff, and combinations thereof.

During the manufacture of cement, a waste material commonly referred toas cement kiln dust (“CKD”) is generated. CKD, as that term is usedherein, refers to a partially calcined kiln feed which is removed fromthe gas stream and collected, for example, in a dust collector duringthe manufacture of cement. Usually, large quantities of CKD arecollected in the production of cement that are commonly disposed of aswaste. Disposal of the waste CKD can add undesirable costs to themanufacture of the cement, as well as the environmental concernsassociated with its disposal. The chemical analysis of CKD from variouscement manufactures varies depending on a number of factors, includingthe particular kiln feed, the efficiencies of the cement productionoperation, and the associated dust collection systems. CKD generally maycomprise a variety of oxides, such as SiO₂, Al₂O₃, Fe₂O₃, CaO, MgO, SO₃,Na₂O, and K₂O.

SUMMARY

The present invention relates to cementing operations and, moreparticularly, in certain embodiments, to compositions and methods thatinclude a latex and at least one of a natural pozzolan (e.g., pumicite)or CKD.

An embodiment of the present invention includes a method comprising:placing a latex composition in a subterranean formation, wherein thelatex composition comprises: latex, a component selected from the groupconsisting of a natural pozzolan, CKD, and a combination thereof, andwater; and allowing the latex composition to set.

Another embodiment of the present invention includes a methodcomprising: placing a latex composition in a subterranean formation,wherein the latex composition comprises: latex, hydraulic cement, acomponent selected from the group consisting of a natural pozzolan, CKD,and a combination thereof, and water; and allowing the latex compositionto set.

Yet another embodiment of the present invention includes a latexcomposition comprising: latex, a component selected from the groupconsisting of a natural pozzolan, CKD, and a combination thereof, andwater.

The features and advantages of the present invention will be readilyapparent to those skilled in the art. While numerous changes may be madeby those skilled in the art, such changes are within the spirit of theinvention.

DESCRIPTION OF PREFERRED EMBODIMENTS

The present invention relates to cementing operations and, moreparticularly, in certain embodiments, to compositions and methods thatinclude a latex and at least one of a natural pozzolan (e.g., pumicite)or CKD. There may be several potential advantages to the methods andcompositions of the present invention, only some of which may be alludedto herein. One of the many potential advantages of the methods andcompositions of the present invention is that inclusion of the naturalpozzolan may provide for more rapid strength development in a latexcement. Another potential advantage of the methods and compositions ofthe present invention is that inclusion of the natural pozzolan and/orCKD in the latex composition may reduce the amount of, or potentiallyeliminate, a higher cost additive, such as Portland cement, resulting ina more economical latex composition.

Embodiments of the latex compositions of the present invention maycomprise a latex, at least one of a natural pozzolan or CKD, and water.In certain embodiments, the latex compositions may further comprise ahydraulic cement. An example of a suitable latex composition maycomprise a latex, pumicite, a hydraulic cement, and water. Anotherexample of a suitable latex composition may comprise a latex, pumicite,a hydraulic cement, CKD, and water. Other optional additives may also beincluded in embodiments of the latex compositions of the presentinvention as desired, including, but not limited to, shale, metakaolin,zeolite, combinations thereof, and the like. In addition, latexstabilizers may be used as needed for a particular application. Asdescribed in more detail herein, embodiments of the latex compositionsof the present invention may be foamed and/or extended as desired bythose of ordinary skill in the art.

The latex compositions of the present invention should have a densitysuitable for a particular application as desired by those of ordinaryskill in the art, with the benefit of this disclosure. In someembodiments, the latex compositions of the present invention may have adensity in the range of about 8 pounds per gallon (“ppg”) to about 16ppg. In the foamed embodiments, the foamed latex compositions of thepresent invention may have a density in the range of about 8 ppg toabout 13 ppg.

Latex may be included in embodiments of the latex compositions of thepresent invention. As will be understood by those skilled in the art,the latex may comprise any of a variety of rubber materials that arecommercially available in latex form. Suitable rubber materials includenatural rubber (e.g., cis-1,4-polyisoprene), modified natural rubber,synthetic rubber, and combinations thereof. Synthetic rubber of varioustypes may be utilized, including ethylene-propylene rubbers,styrene-butadiene rubbers, nitrile rubbers, nitrile butadiene rubbers,butyl rubber, neoprene rubber, polybutadiene rubbers,acrylonitrile-styrene-butadiene rubber, polyisoprene rubber, andAMPS-styrene-butadiene rubber, combinations thereof. As used herein, theterm “AMPS” refers to 2-acrylamido-2-methylpropanesulfonic acid andsalts thereof. Those of ordinary skill in the art will appreciate thatother types of synthetic rubbers are also encompassed within the presentinvention.

One example of a suitable latex may include a water-in-oil emulsion thatcomprises an AMPS-styrene-butadiene rubber. In general, the aqueousphase of the emulsion may comprise an aqueous colloidal dispersion ofthe AMPS-styrene-butadiene rubber. In certain embodiments, theAMPS-styrene-butadiene rubber in the latex may comprise AMPS in anamount ranging from about 7.5% to about 10% by weight of the rubber,styrene in an amount ranging from about 30% to about 70% by weight ofthe rubber, and butadiene in an amount ranging from about 30% to about70% by weight of the rubber. Examples of suitable AMPS-styrene-butadienerubbers are described in more detail in U.S. Pat. Nos. 6,488,764 and6,184,287, the entire disclosures of which are incorporated herein byreference.

Another example of a suitable latex may include a water-in-oil emulsionthat comprises a styrene-butadiene rubber. In general, the aqueous phaseof the emulsion comprises an aqueous colloidal dispersion of thestyrene-butadiene rubber. Moreover, in addition to the dispersedstyrene-butadiene rubber, the emulsion may comprise water in the rangeof about 40% to about 70% by weight of the emulsion and small quantitiesof an emulsifier, polymerization catalysts, chain modifying agents, andthe like. As will be appreciated, styrene-butadiene latex is oftenproduced as a terpolymer emulsion that may include a third monomer toassist in stabilizing the emulsion. Non-ionic groups which exhibitstearic effects and which contain long ethoxylate or hydrocarbon tailsalso may be present.

In accordance with embodiments of the present invention, the weightratio of the styrene to the butadiene in the latex may be in the rangeof about 10:90 to about 90:10. In some embodiments, the weight ratio ofthe styrene to the butadiene in the latex may be in the range of about20:80 to about 80:20. An example of a suitable styrene-butadiene latexhas a styrene-to-butadiene weight ratio of about 25:75 and compriseswater in an amount of about 50% by weight of the emulsion. Anotherexample of a suitable styrene-butadiene latex has a styrene-to-butadieneweight ratio of about 30:70.

Where used, the latex may be provided in the latex compositions of thepresent invention in an amount sufficient for the desired application.In some embodiments, the latex may be included in the latex compositionsin an amount in the range of about 2% to about 45% by weight ofcementitious components. The term “cementitious components” refers tothe components, or a combination thereof, of the latex compositions thathydraulically set, or otherwise harden, to develop compressive strength,including, for example, latex, CKD, fly ash, natural pozzolans (e.g.,pumicite), slag, lime, shale, and the like. In some embodiments, thelatex may be included in the latex compositions in an amount in therange of about 5% to about 27% by weight of cementitious components. Oneof ordinary skill in the art, with the benefit of this disclosure, willrecognize the appropriate amount of the latex to include for a chosenapplication.

A natural pozzolan may be included in embodiments of the latexcompositions of the present invention. Natural pozzolans are generallypresent on the Earth's surface and set and harden in the presence ofhydrated lime and water. Examples of natural pozzolans include pumicite,diatomaceous earth, volcanic ash, opaline shale, tuff, and combinationsthereof. Generally, pumicite is a volcanic rock that exhibitscementitious properties, in that it may set and harden in the presenceof hydrated lime and water. Hydrated lime may be used in combinationwith the pumicite, for example, to provide sufficient calcium ions forpumicite to set. The natural pozzolan may be used, among other things,to replace higher cost cementitious components, such as Portland cement,in embodiments of the latex compositions, resulting in more economicallatex compositions. Where present, the natural pozzolan may be includedin an amount in the range of from about 0.1% to about 50% by weight ofcementitious components, for example (e.g., about 5%, about 10%, about20%, about 30%, about 40%, etc.). In some embodiments, the naturalpozzolan may be present in an amount in the range of from about 25% toabout 50% by weight of cementitious components. One of ordinary skill inthe art, with the benefit of this disclosure, will recognize theappropriate amount of the natural pozzolan to include for a chosenapplication.

CKD may be included in embodiments of the latex compositions of thepresent invention. The CKD generally may exhibit cementitiousproperties, in that it may set and harden in the presence of water. TheCKD may be used, among other things, to replace higher cost cementitiouscomponents, such as Portland cement, in embodiments of the latexcompositions, resulting in more economical latex compositions. The CKDmay be included in the latex compositions in an amount sufficient toprovide the desired compressive strength, density, and/or costreduction. In some embodiments, the CKD may be present in the latexcompositions of the present invention in an amount in the range of about1% to about 99% by weight of cementitious components (e.g., about 10%,about 20%, about 30%, about 40%, about 50%, about 60%, about 70%, about80%, about 90%, etc.). In some embodiments, the CKD may be present inthe latex compositions of the present invention in an amount in therange of about 5% to about 99% by weight of cementitious components. Insome embodiments, the CKD may be present in an amount in the range ofabout 5% to about 80% by weight of cementitious components. In someembodiments, the CKD may be present in an amount in the range of about10% to about 50% by weight of cementitious components. One of ordinaryskill in the art, with the benefit of this disclosure, will recognizethe appropriate amount of CKD to include for a chosen application.

Embodiments of the latex compositions may further comprise water. Thewater used in embodiments of the latex compositions may include, forexample, freshwater, saltwater (e.g., water containing one or more saltsdissolved therein), brine (e.g., saturated saltwater produced fromsubterranean formations), seawater, or combinations thereof. Generally,the water may be from any source, provided that the water does notcontain an excess of compounds that may undesirably affect othercomponents in the latex composition. In some embodiments, the water maybe included in an amount sufficient to form a pumpable slurry. In someembodiments, the water may be included in the latex compositions of thepresent invention in an amount in the range of about 40% to about 200%by weight of cementitious components. In some embodiments, the water maybe included in an amount in the range of about 40% to about 150% byweight of cementitious components. One of ordinary skill in the art,with the benefit of this disclosure, will recognize the appropriateamount of water to include for a chosen application.

A hydraulic cement may be included in embodiments of the latexcompositions of the present invention. A variety of hydraulic cementsmay be utilized in accordance with the present invention, including, butnot limited to, those comprising calcium, aluminum, silicon, oxygen,iron, and/or sulfur, which set and harden by reaction with water.Suitable hydraulic cements include, but are not limited to, Portlandcements, pozzolana cements, gypsum cements, high alumina contentcements, slag cements, silica cements, and combinations thereof. Incertain embodiments, the hydraulic cement may comprise a Portlandcement. In some embodiments, the Portland cements that are suited foruse in the present invention are classified as Classes A, C, H, and Gcements according to American Petroleum Institute, API Specification forMaterials and Testing for Well Cements, API Specification 10, Fifth Ed.,Jul. 1, 1990. In addition, in some embodiments, cements suitable for usein the present invention may include cements classified as ASTM Type I,II, or III.

Where present, the hydraulic cement generally may be included in thelatex compositions in an amount sufficient to provide the desiredcompressive strength, density, and/or cost. In some embodiments, thehydraulic cement may be present in the latex compositions of the presentinvention in an amount in the range of 0.1% to about 99% by weight ofcementitious components. In some embodiments, the hydraulic cement maybe present in the latex compositions in an amount in the range of 0.1%to about 95% by weight of cementitious components. In some embodiments,the hydraulic cement may be present in the latex compositions in anamount in the range of about 20% to about 95% by weight of cementitiouscomponents. In some embodiments, the hydraulic cement may be present inthe latex compositions in an amount in the range of about 50% to about90% by weight of cementitious components. One of ordinary skill in theart, with the benefit of this disclosure, will recognize the appropriateamount of the hydraulic cement to include for a chosen application.

In some embodiments, a pozzolana cement that may be suitable for usecomprises fly ash. A variety of fly ashes may be suitable, including flyash classified as Class C and Class F fly ash according to AmericanPetroleum Institute, API Specification for Materials and Testing forWell Cements, API Specification 10, Fifth Ed., Jul. 1, 1990. Class C flyash comprises both silica and lime so that, when mixed with water, itsets to form a hardened mass. Class F fly ash generally does not containsufficient lime, so an additional source of calcium ions is required forthe Class F fly ash to form a settable composition with water. In someembodiments, lime may be mixed with Class F fly ash in an amount in therange of about 0.1% to about 25% by weight of the fly ash. In someinstances, the lime may be hydrated lime. Suitable examples of fly ashinclude, but are not limited to, POZMIX® A cement additive, commerciallyavailable from Halliburton Energy Services, Inc., Duncan, Okla.

Where present, the fly ash generally may be included in the latexcompositions in an amount sufficient to provide the desired compressivestrength, density, and/or cost. In some embodiments, the fly ash may bepresent in the latex compositions of the present invention in an amountin the range of about 5% to about 75% by weight of cementitiouscomponents. In some embodiments, the fly ash may be present in the latexcompositions in an amount in the range of about 10% to about 60% byweight of cementitious components. One of ordinary skill in the art,with the benefit of this disclosure, will recognize the appropriateamount of the fly ash to include for a chosen application.

In some embodiments, a slag cement that may be suitable for use maycomprise slag. Slag generally does not contain sufficient basicmaterial, so slag cement may further comprise a base to produce asettable composition that may react with water to set to form a hardenedmass. Examples of suitable sources of bases include, but are not limitedto, sodium hydroxide, sodium bicarbonate, sodium carbonate, lime, andcombinations thereof. Where present, the slag cement generally may beincluded in the latex compositions in an amount sufficient to providethe desired compressive strength, density, and/or cost. In someembodiments, the slag cement may be present in the latex compositions ofthe present invention in an amount in the range of 0.1% to about 99% byweight of cementitious components. In some embodiments, the slag cementmay be present in the latex compositions in an amount in the range ofabout 5% to about 75% by weight of cementitious components. One ofordinary skill in the art, with the benefit of this disclosure, willrecognize the appropriate amount of the slag cement to include for achosen application.

A latex stabilizer may be included in embodiments of the latexcompositions of the present invention. Among other things, the latexstabilizer may be included in embodiments of the latex compositions forpreventing the latex compositions from prematurely coagulating. Suitablelatex stabilizers may include a surfactant or combination of surfactantsfor preventing the premature inversion of the latex emulsion. Examplesof suitable latex stabilizers include, but are not limited to,sulfonates and sulfates. Additional examples of suitable latexstabilizing surfactants which are suitable for this purpose may have theformula R-Ph-O(OCH₂CH₂)_(m)OH where R contains an alkyl group of fromabout 5 to about 30 carbon atoms, Ph contains a phenyl group, and m isan integer having value between 5 to 50. An example of a surfactant ofthis formula is ethoxylated nonylphenyl containing in the range of about20 to about 30 moles of ethylene oxide. Another example of a suitablesurfactant is a salt having the formula R₁(R₂O)_(n)SO₃X where R₁contains an alkyl group having 5 to 20 carbon atoms, R₂ contains thegroup —CH₂— CH₂—, n is an integer having value in between 10 to 40, andX is any suitable cation. An example of surfactant of this formula isthe sodium salt of a sulfonated compound derived by reacting a C₁₂₋₁₅alcohol with about 15 moles of ethylene oxide having the formulaH(CH₂)₁₂₋₁₅(CH₂CH₂O)₁₅SO₃Na. Specific examples of suitable latexstabilizers include Stabilizer 434B™ latex stabilizer, Stabilizer 434C™latex stabilizer, and Stabilizer 434D™ latex stabilizer, which areavailable from Halliburton Energy Services, Inc. While embodiments ofthe present invention encompass a wide variety of different latexstabilizers and amounts thereof that may be included in the latexcompositions of the present invention depending on the particular latexused and other factors, the latex stabilizer may be included inembodiments of the latex compositions in an amount in the range of about0.1% to about 30% by weight of the latex in the latex composition and,alternatively, about 10% to about 20% by weight of the latex. One ofordinary skill in the art, with the benefit of this disclosure, willrecognize the appropriate amount of the latex stabilizer to include fora chosen application.

Metakaolin may be included in embodiments of the latex compositions ofthe present invention. Generally, metakaolin is a white pozzolan thatmay be prepared by heating kaolin clay, for example, to temperatures inthe range of about 600° C. to about 800° C. In some embodiments, themetakaolin may be present in the latex compositions of the presentinvention in an amount in the range of about 5% to about 95% by weightof cementitious components. In some embodiments, the metakaolin may bepresent in an amount in the range of about 10% to about 50% by weight ofcementitious components. One of ordinary skill in the art, with thebenefit of this disclosure, will recognize the appropriate amount of themetakaolin to include for a chosen application.

Shale may be included in embodiments of the latex compositions of thepresent invention. Among other things, shale included in the latexcompositions may react with excess lime to form a suitable cementingmaterial, for example, calcium silicate hydrate. A variety of shales maybe suitable, including those comprising silicon, aluminum, calcium,and/or magnesium. An example of a suitable shale comprises vitrifiedshale. Suitable examples of vitrified shale include, but are not limitedto, PRESSUR-SEAL FINE LCM material and PRESSUR-SEAL COARSE LCM material,which are commercially available from TXI Energy Services, Inc.,Houston, Tex. Generally, the shale may have any particle sizedistribution as desired for a particular application. In certainembodiments, the shale may have a particle size distribution in therange of about 37 micrometers to about 4,750 micrometers.

Where present, the shale may be included in the latex compositions ofthe present invention in an amount sufficient to provide the desiredcompressive strength, density, and/or cost. In some embodiments, theshale may be present in the latex compositions of the present inventionin an amount in the range of about 5% to about 75% by weight ofcementitious components. In some embodiments, the shale may be presentin an amount in the range of about 10% to about 35% by weight ofcementitious components. One of ordinary skill in the art, with thebenefit of this disclosure, will recognize the appropriate amount of theshale to include for a chosen application.

Zeolite may be included in embodiments of the latex compositions of thepresent invention. Zeolites generally are porous alumino-silicateminerals that may be either a natural or synthetic material. Syntheticzeolites are based on the same type of structural cell as naturalzeolites, and may comprise aluminosilicate hydrates. As used herein, theterm “zeolite” refers to all natural and synthetic forms of zeolite.Examples of suitable zeolites are described in more detail in U.S.Patent Publication No. 2007/10056475 A1. An example of a suitable sourceof zeolite is available from the C2C Zeolite Corporation of Calgary,Canada. In some embodiments, the zeolite may be present in the latexcompositions of the present invention in an amount in the range of about5% to about 65% by weight of cementitious components. In certainembodiments, the zeolite may be present in an amount in the range ofabout 10% to about 40% by weight of cementitious components. One ofordinary skill in the art, with the benefit of this disclosure, willrecognize the appropriate amount of the zeolite to include for a chosenapplication.

Lime may be included in embodiments of the latex compositions of thepresent invention. In certain embodiments, the lime may be hydratedlime. The lime may be included in embodiments of the latex compositions,for example to, form a hydraulic composition with other components ofthe latex compositions, such as the pumicite, fly ash, slag, and/orshale. Where present, the lime may be included in the latex compositionsin an amount in the range of from about 1% to about 40% by weight ofcementitious components, for example. In some embodiments, the lime maybe present in an amount in the range of from about 5% to about 20% byweight of cementitious components. One of ordinary skill in the art,with the benefit of this disclosure, will recognize the appropriateamount of the lime to include for a chosen application.

A set retarding additive may be included in embodiments of the latexcompositions of the present invention. As used herein, the term “setretarding additive” refers to an additive that retards the setting ofthe latex compositions of the present invention. Examples of suitableset retarding additives include, but are not limited to, ammonium,alkali metals, alkaline earth metals, metal salts of sulfoalkylatedlignins, organic acids (e.g., hydroxycarboxy acids), copolymers thatcomprise acrylic acid or maleic acid, and combinations thereof. Oneexample of a suitable sulfoalkylate lignin comprises a sulfomethylatedlignin. Suitable set retarding additives are disclosed in more detail inU.S. Pat. No. Re. 31,190, the entire disclosure of which is incorporatedherein by reference. Suitable set retarding additives are commerciallyavailable from Halliburton Energy Services, Inc. under the trademarksHR® 4, HR® 5, HR® 7, HR® 12, HR®15, HR®25, HR®601, SCR™ 100, and SCR™500 retarders. Generally, where used, the set retarding additive may beincluded in the latex compositions of the present invention in an amountsufficient to provide the desired set retardation. In some embodiments,the set retarding additive may be present in the latex compositions ofthe present invention an amount in the range of about 0.1% to about 5%by weight of cementitious components. One of ordinary skill in the art,with the benefit of this disclosure, will recognize the appropriateamount of the set retarding additive to include for a chosenapplication.

Optionally, other additional additives may be added to the latexcompositions of the present invention as deemed appropriate by oneskilled in the art, with the benefit of this disclosure. Examples ofsuch additives include, but are not limited to, strength-retrogressionadditives, set accelerators, weighting agents, lightweight additives,gas-generating additives, mechanical property enhancing additives,lost-circulation materials, filtration-control additives, dispersants,fluid loss control additives, defoaming agents, foaming agents,oil-swellable particles, water-swellable particles, thixotropicadditives, and combinations thereof. Specific examples of these, andother, additives include crystalline silica, amorphous silica, fumedsilica, salts, fibers, hydratable clays, microspheres, rice husk ash,combinations thereof, and the like. By way of example, latexcompositions may be foamed and further comprise a gas and a foamingagent. A person having ordinary skill in the art, with the benefit ofthis disclosure, will readily be able to determine the type and amountof additive useful for a particular application and desired result.

As will be appreciated by those of ordinary skill in the art,embodiments of the latex compositions of the present invention may beused for a variety of subterranean cementing applications. By way ofexample, embodiments of the latex compositions may be used in cementingmethods, including primary and remedial cementing. Embodiments of thelatex compositions may be introduced into a subterranean formation andallowed to set therein. As desired by one of ordinary skill in the art,with the benefit of this disclosure, the latex compositions of thepresent invention useful in this method may comprise any of theabove-listed additives, as well any of a variety of other additivessuitable for use in subterranean applications.

In primary cementing embodiments, for example, a latex composition maybe introduced into a space between a subterranean formation and aconduit (e.g., pipe string, casing, expandable casing, liners, etc.)located in the subterranean formation. The latex composition may beallowed to set to form a hardened mass in the space between thesubterranean formation and the conduit. Among other things, the setlatex composition may form a barrier, preventing the migration of fluidsin the well bore. The set latex composition also may, for example,support the conduit in the well bore.

In remedial cementing embodiments, a latex composition may be used, forexample, in squeeze-cementing operations or in the placement of cementplugs. By way of example, the latex composition may be placed in a wellbore to plug a void or crack in the conduit, the cement sheath, theformation, a gravel pack or a microannulus between the cement sheath andthe conduit.

To facilitate a better understanding of the present invention, thefollowing examples of certain aspects of some embodiments are given. Inno way should the following examples be read to limit, or define, thescope of the invention.

Example 1

Five slurries (i.e., Slurries 1-5) were prepared to determine the effectof including pumicite in latex compositions. Each of the slurriescontained Portland Class H cement in an amount of 75% bwoc, 200-meshpumicite in an amount of 25% bwoc, a cement dispersant (CFR-2L™ cementdispersant from Halliburton Energy Services, Inc.) in an amount of 0.48gallons per 94-lb sack of dry blend (“gal/sk”), a defoamer (D-AIR 3000L™defoamer from Halliburton Energy Services, Inc.) in an amount of 0.05gal/sk, a latex containing an AMPS-styrene-butadiene rubber in an amountof 2.0 gal/sk, and water in an amount of 16.4 gal/sk. In this example,by weight of cement (or “% bwoc”) is based on the amount of the Portlandcement and pumicite included in each sample. A cement set retarder andsalt were also included in certain samples as indicated in the tablebelow.

After the slurries were prepared, the slurries and resulting setcompositions were tested to determine their respective thickening times,fluid loss, and mechanical properties in accordance with API RecommendedPractice 10B at the temperature indicated in the table below. For thecompressive strength testing, the slurries were allowed to cure in anultrasonic cement analyzer at the temperature indicated in the tablebelow for twenty-four hours. Immediately after removal from the UCA,compressive strengths were determined using a Tinius Olsen tester. Theresults of these tests are provided in the table below.

TABLE 1 Latex Test Results: 75% Portland Cement and 25% Pumicite 24-HourNaCl Thick. Time Fluid Loss Compressive Retarder (% by wt 70 bc 200° F.Strength Slurry Temp (% bwoc) of water) (hr:min) (cc/30 min) (psi) 1 130— — 2:24 24 2650 2 200 0.2 HR ®-5 — 5:46 28 3570 3 250 0.6 SCR — 3:14 184040 100 ™/0.3 HR ®-25 4 250 0.6 SCR 18 5:49 20 2100 100 ™/0.3 HR ®-25 5300 0.4 SCR 37 4:34 46 2530 100 ™/0.2 HR ®-25

Example 1 thus indicates that the inclusion of pumicite in latexcompositions may provide suitable properties for certain applications ata variety of different downhole temperatures.

Example 2

Eight additional slurries (i.e., Slurries 6-13) were prepared todetermine the effect of including pumicite in latex compositions thatcomprise Portland cement, CKD, and latex. Each of the slurries had adensity of 15.5 ppg and contained Portland Class H cement in an amountof 50% bwoc, 200-mesh pumicite in an amount of 25% bwoc, Joppa CKD in anamount of 25% bwoc, a latex containing an AMPS-styrene-butadiene rubberin an amount of 2.0 gal/sk, a defoamer (D-AIR 3000L™ defoamer fromHalliburton Energy Services, Inc.) in an amount of 0.05 gal/sk, andwater in the amount indicated in the table below. In this example, byweight of cement (or “% bwoc”) is based on the amount of the Portlandcement, pumicite, and CKD included in each sample. Additional additiveswere also included in each sample in the amount indicated in the tablebelow.

After the slurries were prepared, the slurries and resulting setcompositions were tested to determine their respective thickening times,fluid loss, and mechanical properties in accordance with API RecommendedPractice 10B at the temperature indicated in the table below. For thecompressive strength testing, the slurries were allowed to cure in anultrasonic cement analyzer at the temperature listed in the table belowfor twenty-four hours. Immediately after removal from the UCA,compressive strengths were determined using a Tinius Olsen tester.Additionally, the rheological properties of Slurry 7 were alsodetermined using a Fann Model 35 viscometer at the temperature indicatedin the table below using a bob and sleeve and spring #1. The results ofthese tests are provided in the table below.

TABLE 2 Latex Test Results: 50% Portland Cement, 25% Pumicite, and 25%Cement Kiln Dust Slurry 6 7 8 9 10 11 12 13 Temperature (° F.) 180 250300 250 300 180 180 300 Water (% bwoc) 20.58   32.3 32.3 33.3 33.3 21.7421.74 36.62 HR ®-5 retarder 0.2 — — — — 0.2 0.5 (% bwoc) SCR 100 ™retarder —   0.4 0.6 0.4 0.6 — — 0.4 (% bwoc) HR ®-25 retarder —   0.20.3 0.2 0.3 — — 0.2 (% bwoc) Silica Flour¹ (% bwoc) —  35 35 35 35 — —35 Dispersant² (gal/sk) 0.143    0.175 0.175 0.175 0.175 0.143 0.1430.175 Latex Stabilizer³ — — — 0.2 0.2 0.2 0.2 0.2 (gal/sk) NaCl — — — 1818 37 37 37 (% by wt of water) Rheology (at 80° F.) 3 —  8 — — — — — — 6—  13 — — — — — — 100 — 108 — — — — — — 200 — 170 — — — — — — 300 — 265— — — — — — 600 —  330+ — — — — — — Rheology (at 180° F.) 3 —  3 — — — —— — 6 —  5 — — — — — — 100 —  63 — — — — — — 200 — 118 — — — — — — 300 —223 — — — — — — 600 —  330+ — — — — — — Thick. Time 70 bc 4:45 4:35 3:577:20 9:10 1:25 10:15 10:15 (hr:min) Fluid Loss 50  2 74 16 14 42 — 80(cc/30 min) 24-Hour Comp. 4130 3020  3210 1088 2360 2190 — 1327 Strength(psi) ¹The silica flour included was SSA-1 ™ strength stabilizingadditive, available from Halliburton Energy Services, Inc. ²Thedispersant included was CFR-6L ™ cement dispersant, available fromHalliburton Energy Services, Inc. ³The latex stabilizer included wasStabilizer 434-D ™ stabilizer, available from Halliburton EnergyServices, Inc.

Example 2 thus indicates that the inclusion of pumicite in latexcompositions may provide suitable properties for certain applications ata variety of different downhole temperatures.

Example 3

Four additional slurries (i.e., Slurries 14-17) were prepared to furtheranalyze the inclusion of pumicite in latex compositions by comparisonwith latex compositions that do not contain pumicite. Each of theslurries contained Portland Class H cement in an amount of from 50% to100% bwoc, 200-mesh pumicite in an amount from 0% to 25% bwoc, Joppa CKDin an amount from 0% to 25% bwoc, a latex containing anAMPS-styrene-butadiene rubber in an amount of 2.0 gal/sk, a defoamer(D-AIR 3000L™ defoamer from Halliburton Energy Services, Inc.) in anamount of 0.05 gal/sk, a cement dispersant (CFR-6L™ cement dispersantfrom Halliburton Energy Services, Inc.) in an amount of 0.143 gal/sk. Inthis example, by weight of cement (or “% bwoc”) is based on the amountof the Portland cement, pumicite, and/or CKD included in each sample.Certain samples also included a cement set retarder (HR®-5 retarder) inthe amount indicated below to provide comparable thickening timesbetween the slurries.

After the slurries were prepared, the slurries and resulting setcompositions were tested to determine their respective thickening timesand mechanical properties in accordance with API Recommended Practice10B at the temperature indicated in the table below. For the compressivestrength testing, the slurries were allowed to cure in an ultrasoniccement analyzer at 180° F. for twenty-four hours. Immediately afterremoval from the UCA, compressive strengths were determined using aTinius Olsen tester. The results of these tests are provided in thetable below.

TABLE 3 Latex Test Results: Portland Cement, Pumicite, and/or CementKiln Dust Slurry 14 15 16 17 Temperature (° F.) 180 180 180 180 Water (%bwoc) 20.58 29.05 26.19 23.45 Portland Cement (% bwoc) 50 100 75 75Pumicite (% bwoc) 25 — — 25 CKD (% bwoc) 25 — 25 — Cement Set Retarder0.5 — 0.4 — (% bwoc) Thick. Time 70 bc 7:00 6:18 6:10 6:17 (hr:min)24-Hour Comp. Strength 2620 1676 2100 2740 (psi)

Example 3 thus indicates that the inclusion of pumicite in latexcompositions may provide suitable properties for certain applications ata variety of different downhole temperatures. By way of example, thisexample indicates that the inclusion of pumicite in latex compositionsmay provide more rapid strength development in slurries containingPortland cement and/or CKD as compared to slurries without pumicite.

Example 4

Two additional slurries (i.e., Slurries 18-19) were prepared todetermine the effect of including pumicite and cement kiln dust in latexcompositions that do not comprise Portland cement. Each of the slurriescontained 200-mesh pumicite in an amount from 70% to 80% bwoc, Joppa CKDin an amount from 20% to 30% bwoc, hydrated lime in an amount of 10%bwoc, a cement set retarder (HR®-5 retarder from Halliburton EnergyServices, Inc.) in an amount of 0.75% bwoc, a defoamer (D-AIR 3000L™defoamer from Halliburton Energy Services, Inc.) in an amount of about0.05 gal/sk, a latex containing an AMPS-styrene-butadiene rubber in anamount of 2.0 gal/sk, and water in an amount of 32.32 gal/sk. In thisexample, by weight of cement (or “% bwoc”) is based on the amount of thepumicite and CKD included in each sample. Slurry 18 further contained acement dispersant (CFR-2L™ cement dispersant from Halliburton EnergyServices, Inc.) in an amount of 0.29 gal/sk, and Slurry 19 contained thecement dispersant in an amount of 1.0 gal/sk.

After the slurries were prepared, the slurries and resulting setcompositions were tested to determine their respective thickening times,fluid loss, and mechanical properties in accordance with API RecommendedPractice 10B at the temperature indicated in the table below. For thecompressive strength testing, the slurries were allowed to cure in anultrasonic cement analyzer at 180° F. for forty-eight hours. Immediatelyafter removal from the UCA, compressive strengths were determined usinga Tinius Olsen tester. Additionally, the rheological properties werealso determined using a Fann Model 35 viscometer at the temperatureindicated in the table below using a bob and sleeve and spring #1. Theresults of these tests are provided in the table below.

TABLE 4 Latex Test Results: Pumicite and Cement Kiln Dust Slurry 18 19Temperature (° F.) 180  180  Density (ppg) 14   13.5 Pumicite (% bwoc)70 80 Cement Kiln Dust (% bwoc) 30 20 Hydrated Lime (% bwoc) 10 10Rheology (at 80° F.) 3 26  8 6 34 10 30 92 26 60 153  42 100 227  62 200300+ 101  300 300+ 153  600 300+ 300+ Rheology (at 180° F.) 3 15  4 6 21 7 30 65 17 60 114  29 100 177  41 200 300+ 72 300 300+ 97 600 300+ 172 Thick. Time 70 bc (hr:min) 8:42 7:58 Fluid Loss (cc/30 min) 36 3648-Hour Comp. Strength (psi) 1285  1197 

Example 4 thus indicates that the inclusion of pumicite and CKD in latexcompositions that do not contain Portland cement may provide suitableproperties for certain applications at a variety of different downholetemperatures.

Therefore, the present invention is well adapted to attain the ends andadvantages mentioned as well as those that are inherent therein. Theparticular embodiments disclosed above are illustrative only, as thepresent invention may be modified and practiced in different butequivalent manners apparent to those skilled in the art having thebenefit of the teachings herein. Furthermore, no limitations areintended to the details of construction or design herein shown, otherthan as described in the claims below. It is therefore evident that theparticular illustrative embodiments disclosed above may be altered ormodified and all such variations are considered within the scope andspirit of the present invention. While compositions and methods aredescribed in terms of “comprising,” “containing,” or “including” variouscomponents or steps, the compositions and methods can also “consistessentially of” or “consist of” the various components and steps.Whenever a numerical range with a lower limit and an upper limit isdisclosed, any number and any included range falling within the range isspecifically disclosed. In particular, every range of values (of theform, “from about a to about b,” or, equivalently, “from approximately ato b,” or, equivalently, “from approximately a-b”) disclosed herein isto be understood to set forth every number and range encompassed withinthe broader range of values. Also, the terms in the claims have theirplain, ordinary meaning unless otherwise explicitly and clearly definedby the patentee.

1. A method comprising: placing a latex composition in a subterraneanformation, wherein the latex composition comprises: latex comprising anAMPS-styrene-butadiene rubber, a component selected from the groupconsisting of a natural pozzolan, cement kiln dust, and a combinationthereof, and water; and allowing the latex composition to set.
 2. Themethod of claim 1 wherein the latex further comprises a rubber selectedfrom the group consisting of an ethylene-propylene rubber, astyrene-butadiene rubber, a nitrile rubber, a nitrile butadiene rubber,a butyl rubber, a neoprene rubber, a polybutadiene rubber, anacrylonitrile-styrene-butadiene rubber, a polyisoprene rubber, and anycombination thereof.
 3. The method of claim 1 wherein the latexcomposition comprises the natural pozzolan, and wherein the naturalpozzolan comprises pumicite.
 4. The method of claim 1 wherein the latexcomposition comprises the cement kiln dust in an amount of about 1% toabout 99% by weight of cementitious components in the latex composition.5. The method of claim 1 wherein the latex composition further comprisesan additive selected from the group consisting of fly ash, slag cement,metakaolin, shale, zeolite, a gas, crystalline silica, amorphous silica,fumed silica, a salt, a fiber, a hydratable clay, a microsphere, ricehusk ash, lime, and any combination thereof.
 6. The method of claim 1wherein the latex composition further comprises an additive selectedfrom the group consisting of a latex stabilizer, astrength-retrogression additive, a set accelerator, a set retarder, aset accelerator, a weighting agent, a lightweight additive, agas-generating additive, a mechanical property enhancing additive, alost-circulation material, a filtration-control additive, a dispersant,a fluid loss control additive, a defoaming agent, a foaming agent, anoil-swellable particle, a water-swellable particle, a thixotropicadditive, and any combination thereof.
 7. The method of claim 1 whereinthe latex composition is foamed.
 8. The method of claim 1 whereinallowing the latex composition to set comprises allowing the latexcomposition to set in an annulus between the subterranean formation anda conduit disposed in the subterranean formation.
 9. The method of claim1 wherein the cement kiln dust is present in the amount of about 1% toabout 24% by weight of cementitious components in the latex composition.10. The method of claim 1 wherein the cement kiln dust is present in theamount of about 61% to about 99% by weight of cementitious components inthe latex composition.
 11. A method comprising: placing a latexcomposition in a subterranean formation, wherein the latex compositioncomprises: latex comprising an AMPS-styrene-butadiene rubber, ahydraulic cement, a component selected from the group consisting of anatural pozzolan, cement kiln dust, and a combination thereof, andwater; and allowing the latex composition to set.
 12. The method ofclaim 11 wherein the hydraulic cement comprises Portland cement.
 13. Themethod of claim 11 wherein the latex composition comprises the naturalpozzolan, and wherein the natural pozzolan comprises pumicite.
 14. Themethod of claim 11 wherein the latex composition comprises the cementkiln dust in an amount of about 1% to about 99% by weight ofcementitious components in the latex composition.
 15. The method ofclaim 11 wherein the latex composition further comprises an additiveselected from the group consisting of fly ash, slag cement, metakaolin,shale, zeolite, a gas, crystalline silica, amorphous silica, fumedsilica, a salt, a fiber, a hydratable clay, a microsphere, rice huskash, and any combination thereof.
 16. The method of claim 11 wherein thelatex composition further comprises an additive selected from the groupconsisting of a latex stabilizer, a strength-retrogression additive, aset accelerator, a set retarder, set accelerator, a weighting agent, alightweight additive, a gas-generating additive, a mechanical propertyenhancing additive, a lost-circulation material, a filtration-controladditive, a dispersant, a fluid loss control additive, a defoamingagent, a foaming agent, an oil-swellable particle, a water-swellableparticle, a thixotropic additive, and any combination thereof.
 17. Themethod of claim 11 wherein the latex composition is foamed.
 18. Themethod of claim 11 wherein allowing the latex composition to setcomprises allowing the latex composition to set in an annulus betweenthe subterranean formation and a conduit disposed in the subterraneanformation.
 19. The method of claim 11 wherein the cement kiln dust ispresent in the amount of about 1% to about 24% by weight of cementitiouscomponents in the latex composition.
 20. The method of claim 11 whereinthe cement kiln dust is present in the amount of about 61% to about 99%by weight of cementitious components in the latex composition.
 21. Amethod comprising: placing a latex composition in a subterraneanformation, wherein the latex composition comprises: latex, a componentcomprising a combination of a natural pozzolan and cement kiln dust,wherein the natural pozzolan comprises pumicite, and water; and allowingthe latex composition to set.
 22. The method of claim 21 wherein thelatex comprises a rubber selected from the group consisting of anethylene-propylene rubber, a styrene-butadiene rubber, a nitrile rubber,a nitrile butadiene rubber, a butyl rubber, a neoprene rubber, apolybutadiene rubber, an acrylonitrile-styrene-butadiene rubber, apolyisoprene rubber, an AMPS-styrene-butadiene rubber, and anycombination thereof.
 23. The method of claim 21 wherein the latexcomprises an AMPS-styrene-butadiene rubber.
 24. The method of claim 21wherein the cement kiln dust is present in an amount of about 1% to lessthan 25% by weight of cementitious components in the latex composition.25. The method of claim 21 wherein the cement kiln dust is present in anamount of greater than 60% to about 99% by weight of cementitiouscomponents in the latex composition.
 26. The method of claim 21 whereinthe latex composition further comprises an additive selected from thegroup consisting of fly ash, slag cement, metakaolin, shale, zeolite, agas, crystalline silica, amorphous silica, fumed silica, a salt, afiber, a hydratable clay, a microsphere, rice husk ash, lime, and anycombination thereof.
 27. The method of claim 21 wherein the latexcomposition further comprises an additive selected from the groupconsisting of a latex stabilizer, a strength-retrogression additive, aset accelerator, a set retarder, a set accelerator, a weighting agent, alightweight additive, a gas-generating additive, a mechanical propertyenhancing additive, a lost-circulation material, a filtration-controladditive, a dispersant, a fluid loss control additive, a defoamingagent, a foaming agent, an oil-swellable particle, a water-swellableparticle, a thixotropic additive, and any combination thereof.
 28. Themethod of claim 21 wherein the latex composition is foamed.
 29. Themethod of claim 21 wherein allowing the latex composition to setcomprises allowing the latex composition to set in an annulus betweenthe subterranean formation and a conduit disposed in the subterraneanformation.
 30. The method of claim 21 wherein the latex compositionfurther comprises, hydraulic cement.
 31. The method of claim 30 whereinthe hydraulic cement comprises a Portland cement present in an amount ofabout 50% to about 90% by weight of cementitious components in the latexcomposition, wherein the pumicite is present in an amount of about 10%to about 30% by weight of cementitious components present in the latexcomposition, and wherein the cement kiln dust is present in an amount ofabout 10% to about 30% by weight of cementitious compositions present inthe latex composition.
 32. The method of claim 21 wherein the latexcomposition further comprises a hydraulic cement selected from the groupconsisting of Portland cement, pozzolana cement, gypsum cement, highalumina content cement, slag cement, silica cement, and any combinationthereof.
 33. A method comprising: placing a latex composition in asubterranean formation, wherein the latex composition comprises: latex,a cementitious component comprising: hydraulic cement in an amount of atleast about 75% by weight of the cementitious component, and cement kilndust in an amount of about 1% to about 24% by weight of the cementitiouscomponent, and water; and allowing the latex composition to set.
 34. Themethod of claim 33 wherein the latex comprises a rubber selected fromthe group consisting of an ethylene-propylene rubber, astyrene-butadiene rubber, a nitrile rubber, a nitrile butadiene rubber,a butyl rubber, a neoprene rubber, a polybutadiene rubber, anacrylonitrile-styrene-butadiene rubber, a polyisoprene rubber, anAMPS-styrene-butadiene rubber, and any combination thereof.
 35. Themethod of claim 33 wherein the latex comprises an AMPS-styrene-butadienerubber.
 36. The method of claim 33 wherein the cement kiln dust ispresent in the amount of about 1% to about 10% by weight of thecementitious component.
 37. The method of claim 33 wherein the latexcomposition further comprises an additive selected from the groupconsisting of a latex stabilizer, a strength-retrogression additive, aset accelerator, a set retarder, a set accelerator, a weighting agent, alightweight additive, a gas-generating additive, a mechanical propertyenhancing additive, a lost-circulation material, a filtration-controladditive, a dispersant, a fluid loss control additive, a defoamingagent, a foaming agent, an oil-swellable particle, a water-swellableparticle, a thixotropic additive, and any combination thereof.
 38. Themethod of claim 33 wherein the latex composition is foamed.
 39. Themethod of claim 33 wherein allowing the latex composition to setcomprises allowing the latex composition to set in an annulus betweenthe subterranean formation and a conduit disposed in the subterraneanformation.
 40. The method of claim 33 wherein the hydraulic cementcomprises a cement selected from the group consisting of Portlandcement, pozzolana cement, gypsum cement, high alumina content cement,slag cement, silica cement, and any combination thereof.
 41. A methodcomprising: placing a latex composition in a subterranean formation,wherein the latex composition comprises: latex, a cementitious componentcomprising: hydraulic cement in an amount of at least about 80% byweight of the cementitious component, and cement kiln dust in an amountof about 1% to about 20% by weight of the cementitious component, andwater; and allowing the latex composition to set.
 42. The method ofclaim 41 wherein the latex comprises a rubber selected from the groupconsisting of an ethylene-propylene rubber, a styrene-butadiene rubber,a nitrile rubber, a nitrile butadiene rubber, a butyl rubber, a neoprenerubber, a polybutadiene rubber, an acrylonitrile-styrene-butadienerubber, a polyisoprene rubber, an AMPS-styrene-butadiene rubber, and anycombination thereof.
 43. The method of claim 41 wherein the latexcomprises an AMPS-styrene-butadiene rubber.
 44. The method of claim 41wherein the latex composition further comprises an additive selectedfrom the group consisting of a latex stabilizer, astrength-retrogression additive, a set accelerator, a set retarder, aset accelerator, a weighting agent, a lightweight additive, agas-generating additive, a mechanical property enhancing additive, alost-circulation material, a filtration-control additive, a dispersant,a fluid loss control additive, a defoaming agent, a foaming agent, anoil-swellable particle, a water-swellable particle, a thixotropicadditive, and any combination thereof.
 45. The method of claim 41wherein the latex composition further comprises an additive selectedfrom the group consisting of metakaolin, shale, zeolite, a gas,crystalline silica, amorphous silica, fumed silica, a salt, a fiber, ahydratable clay, a microsphere, rice husk ash, and any combinationthereof.
 46. The method of claim 41 wherein the latex composition isfoamed.
 47. The method of claim 41 wherein allowing the latexcomposition to set comprises allowing the latex composition to set in anannulus between the subterranean formation and a conduit disposed in thesubterranean formation.
 48. A method comprising: placing a latexcomposition in a subterranean formation, wherein the latex compositioncomprises: latex, a cementitious component comprising: hydraulic cementin an amount of at least about 75% by weight of the cementitiouscomponent, and a component selected from the group consisting of anatural pozzolan, cement kiln dust, and a combination thereof, whereinthe component is present in an amount of about 1% to about 24% by weightof the cementitious component, and water; and allowing the latexcomposition to set.
 49. The method of claim 48 wherein the latexcomprises a rubber selected from the group consisting of anethylene-propylene rubber, a styrene-butadiene rubber, a nitrile rubber,a nitrile butadiene rubber, a butyl rubber, a neoprene rubber, apolybutadiene rubber, an acrylonitrile-styrene-butadiene rubber, apolyisoprene rubber, an AMPS-styrene-butadiene rubber, and anycombination thereof.
 50. The method of claim 48 wherein the latexcomprises an AMPS-styrene-butadiene rubber.
 51. The method of claim 48wherein the latex composition further comprises an additive selectedfrom the group consisting of a latex stabilizer, astrength-retrogression additive, a set accelerator, a set retarder, aset accelerator, a weighting agent, a lightweight additive, agas-generating additive, a mechanical property enhancing additive, alost-circulation material, a filtration-control additive, a dispersant,a fluid loss control additive, a defoaming agent, a foaming agent, anoil-swellable particle, a water-swellable particle, a thixotropicadditive, and any combination thereof.
 52. The method of claim 48wherein the latex composition further comprises an additive selectedfrom the group consisting of metakaolin, shale, zeolite, a gas,crystalline silica, amorphous silica, fumed silica, a salt, a fiber, ahydratable clay, a microsphere, rice husk ash, and any combinationthereof.
 53. The method of claim 48 wherein the latex composition isfoamed.
 54. The method of claim 48 wherein the component comprises thenatural pozzolan, the natural pozzolan comprising a pozzolan selectedfrom the group consisting of pumicite, diatomaceous earth, volcanic ash,opaline shale, tuff, and any combination thereof.
 55. The method ofclaim 48 wherein the component comprises the natural pozzolan, thenatural pozzolan comprising pumicite.
 56. The method of claim 48 whereinallowing the latex composition to set comprises allowing the latexcomposition to set in an annulus between the subterranean formation anda conduit disposed in the subterranean formation.